Small footprint 32V buck converter for point of load designs

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By Nick Flaherty

Diodes has launched a series of synchronous buck converters for point of load designs in automotive applications.

With 2A and 3A current ratings respectively, the AP6320xQ and AP6330xQ devices support a wide input voltage range, going from 3.8V to 32V. The point-of-load (PoL) applications include powertrains, instrumentation clusters, telematics, and infotainment systems. They can also benefit the performance of automotive body electronics and lighting, plus advanced driver assistance system (ADAS) implementations.

The proprietary gate driver arrangement in the buck converters mitigates switching node ringing effects, without lengthening MOSFET turn-on and turn-off times. This considerably reduces the high frequency radiated electromagnetic interference (EMI) noise normally associated with MOSFET switching.

The AP6320xQ integrates 125/68mΩ high/low-side power MOSFETs while the AP6330xQ integrates 70/40mΩ high/low-side power MOSFETs, enabling both to deliver high-efficiency step-down DC-DC conversion with minimal external component count. Adopting peak current mode control and using integrated loop compensation networks also helps to streamline deployment.

The AP63200Q, AP63203Q, AP63205Q, and AP63300Q devices incorporate a frequency spread spectrum (FSS) function that helps alleviate EMI. Also featured is a pulse frequency modulation (PFM) mode that significantly improves light load efficiency levels. It enables a quiescent current (IQ) of 22μA (typical), which is almost half that of most competing devices. This enhances conversion efficiency levels when under light load situations.

The AP63200Q, AP63201Q, AP63300Q, and AP63301Q support 500kHz switching frequencies. The AP63203Q and AP63205Q support 1100kHz, and their faster switching frequency allows the use of smaller accompanying inductor and capacitor components. This allows further board space savings and an overall reduction in bill-of-materials (BOM) costs.

The AP6320xQ and AP6330xQ buck converter series are supplied in compact TSOT26 packages, with each having an operational temperature range of -40°C to +125°C. Undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown mechanisms are all incorporated to ensure ongoing reliability.

The AP6320xQ and AP6330xQ are AEC-Q100 Grade 1 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. In 1000 piece quantities, the AP6320xQ is available at $0.40 and the AP6330xQ is available at $0.43.


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